Drilling machine



Filed'Jan. e, 192s 2 sheets-'sheet 1 Y I Feb.' 8., 1927.

' s. H. GlLMAN DRILL'ING MACHINE Filed Jan. e, 192:5 '2 sheets-smet 2 @Qf f Patented Feb. 8, 1927.

,naar i GEORGE n. erm/LAN, or BELMONT, MASSACHUSETTS. Y'

y murrine MACHINE.

Application ined January. 6, 1923. serial No.' 611,172.

` Fig. 3 is a section on 'the line 3-.3 of

Fig. 4 is a section onV the line ,4-4 of Fig. 3; and

Fig. 5 is a section on the line 5-5 of Eig. 2.

. Referring to the'drawings I have illustrated a drill steel 1, the shank 3 of which is received in the chuck 5 in such manner* that the drill steel is constrained to rotate with the chuck. Rearwardly of the drill steel I provide a hammer piston, the latter as shown having the head 7 and the rear'- ward and forward extensions 9 and 11, these extensions, as clearly illustrated by Figs. 1 and 2 of the drawings, being ,of smaller diameter than the-head, and the extension 9 being reduced in diameter at 13 adjacent itsl juncture with saidv head.

As illustrated the .section 15 of the casing for the machine is provided with a bore 17 in which the head 7 of the piston reciprocates and with the Vbore 19 in which the forwardextension 11 reciprocates. To the rearward end of the casing section 15 is fitted the section 21 to which is rigidly and permanently securedV the casing section received in the bore 23 of the section 21. Axially of the section 25 is abore 27 in which reciprocates the rearward extension 9 of the piston. Interiorly of the section 21 section 25 is provided with the 'exterior grooves 29, 31 and33.. As best .shown by Figs. 1 and 2, the section 25 at the rearward side of the. section 21 iis provided with a liange 35 which abuts the rearward side ofj section 21, while rearwardly of the flange the section 25 is reduced in diameter at 3l, the extreme rearward end of the section 25 heing reduced to a still smaller diameter portion 39 to provide the shoulder 41.

For conducting motor luid to themachine the section 21 herein is provided with a motive` fluid connection 43 from which leadsV a passage 45 tothe annulargroove 33, said passage being controlled by the "rthrottle valve 47 .p Leading-from the groove 33 are thediametrically oppositely positioned radial passages 49' which intersect the bore 27.

Leading from the passages' 49 rearwardly through the wall in the section 25 are passages 51 which open intov the bore 27 at its extreme rearward end, this: latter loeing Aeffected by means ofan annular enlargement 53 of the bore 27 which-intersects'said passages '51.f Further the passages 49 and 51 are caused to open intothe bore 27 by means n* of slots 55k formed in the interior of the 'wall of the bore 27 and intersecting these passages. Leading from the bore 27 in the 1 plane of the slots 55 arerthe dia-metrically 4oppositely positioned radial ypassages 57 which connect with the annular gro-ove 31. Leading from the groovel 31 are passages 59 which enter the forward end of the bore 17 by means of ports 61. l v

Herein for controlling the exhaust, midway the length of the -bore 17 is an arcuate slot 63 with which connects a rearwardly extending passage 65 which communicates with the exhaust nozzle 67 .of the'machiue.

The operation of the parts, so far described` is vas follows: When the valve 47 is turned to cause motive fluid to enter the groove 33 the motive fluid passes by thevway of the passages 49 and 51 and groove 53 to the interior of the bore 27. This occurs continuously while the machine is in operation; con-A sequently a continuous pressure is maintained on the rearward end of the rearward piston extension 9. When-the parts are in the position shown by Figs. 1 and 2 motive fluid ,passes fromthe bore 27 through the passages57 to theA groove 31, whence it is conducted by means of the passages 59 to the forward end of the bore 17, the grooves 55 at this time being uncovered by the piston extension tov augment they supply of air to the bore 17. The admission to the forward y cndof the bore v17 drives the piston rear# Wardly, motive fluid heretofore admitted to the rearward end of the bore 17 having in the position of parts under consideration escaped to the atmosphere through the grooveV 63, passage 65, and exhaust nozzle 67. Then the piston moves rearwardly the extension 9 closes the slots 55 and passages c V57, and when the piston reachesthe rearward portion of its stroke the reduced portion 13 of the extension 9 establishes coininunication between 'the passages 49 and the rearward end of the bore 17. Consequently 'the piston travels forwardly under the influence of the air on the rearward4 faces of Y. the' head'7 and extension 9, the motive fluid beingperinittedto escape from the forward end yof the bore 17 by way-of the groove 63.

p As the specific way in which the piston is Y caused to reciprocate forms no part of my present invention itis believed unnecessary to further describe the same.

,- Referring to Fig. 1,; it will be noticed that as illustrated the reduced diameter portion f 39 ofthe casing section 25 has mounted thereon they slceve-.likefsection 69provided at its forward end with the flange 71 abutting-the shoulder 4 1of the section 25. Surrounding the section 69is thel section V73 which is rigidly and permanently secured to thesection 69. In the interior surfaceof the sec-tion -69 land the 1 interior surface ofthe section 73y are formed registering annular grooves 75 and 77 respectively, `which together form a motive 4fluid reservoir fory aV purpose hereinafter described. Thesections i 69 and 73 are heldin assembled relation with the machine by means of the flanged plug 78 which is screw-threaded linto the socket 80 `Vof the casing-.is shownsas cut away at 81 formed in the rearward end of the section 25. The reduced diameter Yportion 37 of the section 25 forms a bearing for a gear wheel "79, opposite sides of which fit the flanges 71 and 35 in a fluid tight manner. Intermediate its ends the exterior of the bearing afforded yby the reduced portion 37 to :form crescent shaped chambers 83`best shown by Figs. 3 and 4. The gear wheel 79 is :provided with cylindrical bores .85

which intersect the interior surfaceof the wheel and are enlarged at one side thereof the portion of the plug which fits the enlargement 87 of the bore 85 forms a wing 92.v From the enlargement S7behind the wing'A are drill holes 93 which open on the exterior of the gear wheel. At opposite ends the gear 79 is recessed to receive Vthe d. plates 94 which close the ends of the bores 85 and abut the Vends' of the plugs 89, the plates being held in position by means Iof pins 95 as shown in Fig. 4. Y

`I-Iereinfor conducting motive fluid kto the Ychambers 83 is a pair of passages 97 each of which, as best shown by Figs. 3 and 4,

leads from the groove through the inein- Leidas?V ber 69 and sect-ion 25 and opens into one of the respective, chambers 83 near the end of the chamber asshown at 97 in Fig. Communicating with the other ends of the chambersy 83 are passages 99 which open into the groove 29, these passages serving to exhaust the motive fluid. from the chambers.

As shown byFig. 2 the groove 75 is placed into communication with a 'source ofmotive vfluid supplyby way of a passage 1'01 Vwhich is formed through the section 73, the section of the casing 103 enclosing thegear and the section 21, and is controlled by the valve 105. The groove 29 is yplaced in communication with the exhaust nozzle'67 of t-he machine by way ofv ar passageY 107 'formed' through the section 21, and for, venting Y leakage the interior of the section 103 is placed in communication with the passage 107 byy wayof ythe passage 109.

F rom the foregoing it will be seen thatV vthe passages 99 when the plugs uncover` the latter, the parts being so arranged 'that before one plug uncovers the passage 99 the plug behind it Ioverruns the corresponding passage 97. s

It will be understood that the gear 7 9' and plugs 89 together form the rotor of an expansible chamber fluid pressure motor of the rotating cylinder type; further, that in common with all motors of this type the rotor has a working pressure surface and the stator a pressure abutment surface, the moicoA tive fluid acting" between the workingpressure surface and pressure abutment'surface to causey movement ofthe rotor. v y

To cause the motor described to' rotate the chuck I provide at opposite sides of the machine gears 111. which mesh with the gear79 and are keyed to shafts 113 extending through the casing at opposite sides thereof. The shaftsare mounted in bearings and carry at their forward ends eccentrics 117 integrally -formed with the shafts. Mounted .upon opposite eccentrics 117 are yokes 119, each of which is provided with the internal gear teeth Y121 in mesh with external gear teeth 123 on the chuck 5. lVhen the shafts rotate the eccentrics give the yokes a gyiatoryY motion which causes the chuck to slowly rotate. It will be understood by this construction thatthe motor is connected to the chuck by means of reduction gearing.

Although I have described for purposes of illustration one specific embodiment of my invention it is to be understood that within the scope of my invention wide yde-v viations may be made therefrom Without Vdeparting from the spirit of my invention.

Claims: l.' Ina hammer rock drill, a chuck Jformed for carrying a drill steel, a hammer piston having a head and a rearward extension of smaller diameter, a. casing having bores in relatively non-rotatable parts for receiving fs said head and extension of said hammer pis- Ving 'for 'transmitting the rotation of said member to said chuck for rotating the latter.

2. In a hammer rock drill, a chuck formed for carrying a drill steel, a hammer piston having a head and a rearward extension of smaller diameter, a casing having bores in relatively non-rotatable parts for receiving said head and extension'ot said hammer piston and said chuck, means for admitting motive fluid to said bores for acting upon said piston, an expansible chamber fluid pressure motor for rotating said chuck, said motor comprising a rotor surrounding the portion of said casing receiving said extension of said hammer piston, said rotor having a working pressure surface which iforms part Loi: the wall of the `expansible chamber of said motor, means providing a 'stationary pres sure abutment surface for the motive iuid Vacting` on said working pressure surface, and

reduction gearing means connecting said rotor to said chuck for causing rotation vof the former to be imparted to the latter. c

3. In a hammer rock drill, a chuck formed for carrying a drill steel, a hammer piston having a head and a rearward extension of smaller diameter, a casinghaving bores in relatively non-rotatable parts for receiving said head and extension oifsaidl hammer piston and said chuck, a fluid pressure motor for rotating said chuck, said fluid pressure motor providing an expansible chamber having a rotary working pressure surface and a non-rotary pressure abutment surface, said rotary working pressure surface being' formed on a rotor and comprisingpart of the walls oi' said expansible chamber, said rotor surrounding the portion of the casing receiving said rearward extension of said hammer piston, means for admitting and exhausting motive fluid to and from said expansible chamber, and reduction gearing means operatively connecting said rotor to said drill steel. f

4. In a hammer rock drill, a hammer piston having a head and an extension oi' smaller diameter, a fluid pressure rotary,

cylinder expansible chamber vmotor surrounding sa-id extensionoi" said hammer pls'- ton, the rotary cylinder of said motor care rying yan annular series ot' externalv gear teeth, aV chuck formed for carrying a drill steel and reduction gearing operatively connecting said vannular' series. of gear teethV to said chuck forcausing the Arotation oi'` said cylinder to 'be imparted to saiddrilll steel.v i .c

5. ln a rock drill, ahammer piston, a

drill steelchuclna casing having relatively vnon-rotatable parts for. said hammerpiston and chuck, an annular member surrounding and, being mounted for rotation on said casing, external gear teeth carried by said. annular member, said gear teeth being op# eratively connected to said chuck, and means forcausing rotationoiA said annularfmemvber by admitting motive luidbetween said member. andthe portion of the casing which it surrounds.

6. Ina rock drill, a hammer piston, a drill steel chuck, a casing having relatively' non-rotatable parts for said hammer piston and chuck, an annular member mounted for rotation on said casing coaxially with said chuck and surrounding said hammer piston,

external geary teeth Carried by said annular member,- said gear teeth beine operatively connected to saidy chuck,r an -means vfor causing rotation of saidannularl member` by admitting motive fluid between said member and the portion of the casing which it surrounds. Y

7,. ln a rock drill, a hammer piston, a` chuck, a casing Jfor said hammer piston and chuck, an external gear member surrounding said casing and piston and having a bearing at said casing, saidV bearing being formed avchamber closed/by said member, means` for, admitting motive fluid to Vand exhaust ing it from said chan'ib'er,and'inotion transmitting means including thegear teeth oi said external gear member for connecting said .member with said chuck.

8. In a rock drill, a hammer piston, a chuck, a casing for said hammer piston and Abetween its ends to provide at its exterior chuck, a member mounted axially oii'and" means for admitting motive iiuid ltoA andV Vexhausting it from said chamber, and niotion transmitting means connecting Y said member with said chuck including a gear meshing with said external gear.

10. In a hammer rock drill, a chuck formed for carrying a drill steel, a hammer pistonV and said pressure abutment surface being non-rotatable. l i

k11. In a hammer rock drill, achuckformed Vfor carrying a drill steel, a hammer piston for operating said drill steel, a gear eoaX- ia-lly arranged With the parts mentioned, a gear meshing with the first mentioned gear and operatively connected with said chuck, a

i casing for said piston, chuckand gears, and

means for admitting .motive fluid to said casing to act only on the first mentioned of said'gears for rotating both gears.

12. In a rock drill, a chuckformed for carrying a drill steel, a hammer ypiston for operating said drill steel, a gear .coaxially arranged with said chuck and piston, aipair of gears arranged at opposite sides of said first mentioned gear and meshing therewith, said pair of gears being connected to said chuck, and means for rotating all said gears by motive fluid vacting' only on said'iirst mentioned gear. v V13. In a rock drill, a cylinder, having a detachable rear end section, a piston having kahead in said cylinder and a reduced eX- tension in said rear end section, a rotary cyl*y inder motor surrounding said rear end section and the cylinder bore for said extension,

and chuck operatively connected to said motor. Y Y

14. In a rock drill, a cylinder having a detachable rear end section, a piston having a head in said cylinder and a reduced eX- tension in said rear end section, a motor comprising a rotor and means providing a non-rotary abutment surface, said rotor being mounted in said rear end section concentrically with the borefor said'piston, and a chuckV operatively connected to said rotor.

15. v'In a hammer rock drill, achuckformed for carrying a drill steel, a hammer piston having a head and an extension of smaller diameter, a casing having bores in relatively Vnon-rotatable parts for receiving said headV and extension of said'hammer piston and said chuck, a member surrounding the portion of said casingreceiving said extension Vof said hammer piston, means for causing rotation of said ymember by admitting and exhausting motive fiuid between saidmembei' and the portion ofsaidvcasing Which said member surrounds, and reduction .gearing non-rotatable parts for receiving said head and extension of said hammer piston and said chuck, an eXpansible chamber fluid pressure motor for rotatingsaid chuck, said motor comprising a rotor surrounding the portion of said casing receiving saideXtension of said hammer piston, said rotor having a Working pressure surface which forms partiof the lWall of' the expan'sible chamber of said motor, means providinga stationary pressure abutment surface for the motive Huid acting on said Working pressure surface, and reduction gearing means connecting said rotor to said chuck for causing rotation of the former to be imparted to the latter.- Y

17. In a hammer rock drill, a chuck formed for carrying a ydrill steel, a hammer vpiston having a head andl an extension of smaller diameter, a casing having bores in relatively non-rotatable parts for receiving said head and extension of said'hammer piston and said chuck, a fluid pressure motor for rotat-y ing said'chuclgsaid fiuid pressure motor being constructed to provide an eXpansible chamber having a rotary Working pressure sui-face and a non-rotary pressure abutment surface', said rotary Working pressure sur# face being Vformed on` a rotor comprisinglp art of thefwalls of said expansible cham-V ber, said rotor lsurrounding the portion of lll() the casing receivingsaid Aextension of saidV Y hammer piston, means for admitting and eX- hausting motive fluid to and from said eX- pansible chamber, and reduction gearing means operatively connecting' said rotor to said drill steel.

18. In a i'ock drill, a chuck, a piston, a casng for said chuck and piston, a pair of shafts disposed at opposite sides of said casing, an eccentric on each shaft at the side of said chuck, a yoke carried by .said eccentrics, said yoke `surrounding said chuck and having internal gear teeth meshed with external gear teeth on said chuck, a gear carried by the rearward portion. vof each shaft, agear meshing with both of said gearson said shafts, and means for causing 'said'.y

iso i relaas? tries, said yoke surrounding said chuck and having internal gear teeth meshed with eX- ternal--fgear teeth on said chuck, a gear carried/by the rearward portion of each shaft, a gear having an annular body meshing with both 01" said gears on said shafts, and means for admitting motive fiuid to the space' surrounded by said annular body for rotating it. v

` 20. In a rock drill, a chuck formed for carrying a drill steel, a hammer piston, a casing for said chuck and piston, anda rotary cylinder' motor surrounding said easing and piston, and reduction gearing connecting said cylinder t said chuck.

2l. In a rock drill, a chuck formed for carrying a drill steel, a Vhammerpiston, a casing forv said chuck and piston, and a motor having' a rotary annular cylinder surrounding said casing and piston, and reduction gearing connecting said cylinder to said chuck. Y

22.7111 a rock drill, a chuck form-ed for carrying a ydrill steel, a piston, a casing torA said chuck and piston, an annular member mounted for rotation on said casing and surrounding said piston, movable Vanes carried by said annular member and cooperating With said casing, and speed reducing means connecting said annular member to said chuck. a Y

23. In a drillingvmachine, a chuck, a casing, shafts at the sides of said casing, eccentries carried by said shafts, a yoke carried Y by said shafts having internal gear teeth meshing with external gear teeth on saidv chuck, pinions carried by said shafts, a'.

gear meshing with both lpinions, a bearing on said casing' tor said gear, and means permittingfmotive -fiuid to act betweensaid gear and casing for causing said gear to rotate.

9A. In a drilling machine, a chuck, a casing, shafts at the sides of said casing, ec-v being non-rotatably securedto said shafts.

25. In a motor and reduction gear, a driven member having external gear teeth, a

yoke vhaving internal gear teeth meshing with the external gear teeth 4of said chuck, eecentrics supporting said yole, shafts carrying said eccen-trics, pinions on said shafts, a spur gear meshing With said pinions, a

bearing for said spur gear, and means for admitting motive fluid between said spur gearand its bearing for rotating said gear.`

In testimony whereof, I have signed my name to this specification. l y

' GrERGrEv H. GILMAN CERTIFICATE 0F CRRECTION.

Patent No. l,6l6,487. 4 Granted February 8, 1927, to

GEORGE He GILMAN,

It is hereby certified tha error appears in the printed specificaiion of ille above numbered patent requiring; correction as follows: Page 3, line 106, claim 7, for the Word "at" read on"; and that the said Letters Patent should be read with this correciion therein that the same may conform to the record of the case in the Pateni Office.

Signed and sealed this 29th day of March, A. D. 1927.

l M. .L Moore, Seal. Acting Commissioner of Patents. 

